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List the features of java programming language.
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In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?
Define how does a try statement determine which catch clause should be used to handle an exception?
what is request dispatcher and how does it work?
What are the two ways in which thread can be created?
What is an arraylist in java?
Explain the hierarchy of java exception classes?
When should I use a singleton?
What ide should I use for java?
my method "abc" return array of interface "xyz" and "pqr" is abstract class implements abc and class "jkl" extends pqr My problem 1) when i call abc it retrun array xyz how can i do this hint xyz refer_xyz = new jkl(); but i can't create array. 2)I want to access method of jkl using reference of xyz??
What is encapsulation? Elaborate with example?
What is the use of TL?
Can we create constructor in abstract class ?
Core Java 
